It is a  Flashing Alarm Yellow Digital Voltmeter,Power Supply DC7-25v,Measuring Range DC 0-30V,White Case Design, It has small size, anti-interference ability, high efficiency, long term stable and reliable quality,easy installation and use,Applied to the  Motorcycle, Car, E-bike, ATV, Scooter, Battery ,home,factory,garden,industrial equipments and other controlled systems